海藻纤维废渣制备多孔碳的吸附性能优化及数据模型构建  

Optimization of adsorption performance and data model construction of porous carbon prepared from seaweed fiber waste

作　　者：杨栩 陈逸聪 罗铭宇 王远鹏[1] YANG Xu;CHEN Yicong;LUO Mingyu;WANG Yuanpeng(College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China)

机构地区：[1]厦门大学化学化工学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2023年第5期774-782,共9页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(22038012);福建省科技厅重大专项(2020NZ012015)。

摘　　要：海藻纤维废渣为海藻琼脂提取工艺的副产物,富含碳、氧等元素,以其为原料制备高性能生物质衍生多孔碳可实现海藻纤维废渣的高值化利用.本研究以海藻纤维废渣制备多孔碳,通过吸附等温线和动力学探究吸附行为;并利用XGBoost(eXtreme Gradient Boosting)算法构建氨氮吸附容量的预测模型,分析多孔碳制备过程的升温速率、碳化温度及碳化时间等因素对氨氮吸附能力的影响.实验结果表明:海藻纤维基多孔碳材料对氨氮有较好的吸附效果,最大吸附容量可以达到3.514 mg/g,其动力学过程符合拟二级吸附动力学模型、颗粒内扩散模型和Langmuir吸附等温模型;实验和模型证明多孔碳制备过程中碳化温度对氨氮吸附的影响最大,升温速率和碳化时间次之;通过数据模型得出以5℃/min速率升温至1000℃碳化120 min制备的多孔碳具有最优的氨氮吸附性能.本研究提出一种数据模型,并结合实验成功证明该模型预测的准确性,可为今后生物质衍生多孔碳的制备方法提供预测依据.Seaweed fiber,a by-product of the seaweed agar extraction process,is rich in carbon,oxygen,and other elements,making it a good raw material for the preparation of carbon materials.To achieve high-value utilization of the waste,high-performance porous carbon was prepared from the seaweed fiber waste for the adsorption of ammonium.In this study,porous carbon was prepared from the seaweed fiber,and the adsorption behavior was explored through adsorption isotherm and kinetics.The XGBoost(eXtreme Gradient Boosting)model was used to establish a prediction model of ammonium adsorption capacity and to analyze the effects of the main parameters(heating rate,annealing time and annealing temperature)of the preparation process on the ammonium adsorption performance by the prepared carbon.The experimental results showed that the porous carbon derived from seaweed fiber had a good adsorption performance on ammonium,with a maximum adsorption performance of 3.514 mg/g.The kinetic process conformed to the pseudo-second-order adsorption kinetic model,the intra particle diffusion model,and the Langmuir adsorption isothermal model.It was also shown that the annealing temperature had the greatest impact on ammonium adsorption during the preparation of porous carbon,followed by heating rate and annealing time.The porous carbon which was prepared with a heating rate of 5℃/min to reach 1000℃for 120 min has the best ammonium adsorption performance.This study proposed a data model and the high prediction accuracy of which was proved by experiments,providing a basis for the forecast of biomass derived porous carbon.

关 键 词：海藻纤维废渣 多孔碳 氨氮吸附 数据模型 

分 类 号：X705[环境科学与工程—环境工程]